Prince William has delighted royals by sharing a previously-unseen photograph of his wife Princess Kate in honour of her 43rd birthday. The future King posted the snapshot on social media , alongside a very personal message which reads: "To the most incredible wife and mother. The strength you’ve shown over the last year has been remarkable. George, Charlotte, Louis and I are so proud of you. Happy Birthday, Catherine. We love you. W." The striking black and white image shows the princess